1965407885 has 24 divisors (see below), whose sum is σ = 2768756760. Its totient is φ = 1335325824.

The previous prime is 1965407863. The next prime is 1965407911. The reversal of 1965407885 is 5887045691.

It can be written as a sum of positive squares in 4 ways, for example, as 518518441 + 1446889444 = 22771^2 + 38038^2 .

It is not a de Polignac number, because 1965407885 - 2¹² = 1965403789 is a prime.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10094 + ... + 63503.

It is an arithmetic number, because the mean of its divisors is an integer number (115364865).

Almost surely, 2^1965407885 is an apocalyptic number.

It is an amenable number.

1965407885 is a deficient number, since it is larger than the sum of its proper divisors (803348875).

1965407885 is a wasteful number, since it uses less digits than its factorization.

1965407885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73725 (or 73718 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 53.

The square root of 1965407885 is about 44332.9210068545. The cubic root of 1965407885 is about 1252.6148749290.

The spelling of 1965407885 in words is "one billion, nine hundred sixty-five million, four hundred seven thousand, eight hundred eighty-five".